JP2019043015A - Scribing wheel - Google Patents

Abstract

An object of the present invention is to provide a scribing wheel capable of forming a scribe line on a substrate satisfactorily and having a long life. A scribing wheel includes: a plurality of blades formed along an outer peripheral edge; Is provided. The groove 102 has a notch 102a formed at the center in the circumferential direction toward the central axis L0. When viewed in a direction parallel to the central axis L0, the depth of the groove portion 102 to the deepest portion 102b of the cut portion 102a is in a range of 7 to 10 μm. [Selection diagram] FIG.

Description

  The present invention relates to a scribing wheel for forming a scribe line on a brittle material substrate such as a glass substrate.

  The division of a brittle material substrate such as a glass substrate is performed by a scribing step of forming a scribe line on the surface of the substrate and a breaking step of dividing the substrate along the formed scribe line. In the scribing step, the scribing wheel is moved along a predetermined line while being pressed against the substrate surface. Thereby, the scribing wheel rolls on the substrate surface to form a scribe line.

  Patent Document 1 below describes a scribing wheel in which a plurality of grooves are formed at a predetermined pitch on an outer peripheral ridge line. By using the scribing wheel having this configuration, it is possible to reliably form vertical cracks in the substrate immediately after the start of scribing and to form deep vertical cracks.

Japanese Patent Application Laid-Open No. 09-188534

  In the scribing wheel described in Patent Document 1, a scribing line is formed by forming pits intermittently at a predetermined pitch on the substrate surface and connecting vertical cracks formed immediately under the pits according to the above configuration. It is formed. However, even the scribing wheel described in Patent Document 1 degrades as the period of use elapses. In particular, the blade portion in contact with the substrate wears more than other portions, and it becomes difficult to form a deep vertical crack in the substrate as in use.

  In view of such problems, it is an object of the present invention to provide a scribing wheel capable of favorably forming a scribe line on a substrate surface and having a long life.

  The main aspect of the present invention relates to a scribing wheel for forming a scribing line on a substrate. The scribing wheel according to this aspect includes a plurality of blade portions formed along the outer peripheral edge, and a plurality of groove portions provided between the adjacent blade portions in the circumferential direction and recessed toward the central axis. Here, the groove has a cut toward the central axis at the center in the circumferential direction, and at least the deepest portion of the cut has a depth not to contact the substrate.

  According to the scribing wheel according to this aspect, when the scribing wheel rolls on the substrate surface, a portion in the vicinity of the blade portion bites into the substrate to form a dent on the substrate surface. As the wear of the blade progresses, the blade gradually scrapes toward the central axis from the portion in contact with the substrate as seen in the direction parallel to the central axis, and becomes flat. Thus, the shape of the blade portion changes, and the blade portion hardly bites into the substrate. On the other hand, in the scribing wheel having the above-described structure, since the cut portion is formed in the groove portion, that is, the groove portion is formed to be deeper, even if the wear of the blade portion progresses, A blade that can bite is maintained. Therefore, the scribing wheel can form a good scribe line on the substrate, and can separate the substrate. Therefore, with the scribing wheel according to this aspect, a long-life scribing wheel can be configured.

  In the scribing wheel according to the present aspect, when viewed in a direction parallel to the central axis, a depth to the deepest portion of the cut portion in the groove may be configured to be in a range of 7 to 10 μm. Within this range, even if the wear of the blade progresses, the blade can bite into the substrate, and the scribing wheel can form a good scribe line on the substrate. Thus, a long-lived scribing wheel can be configured.

  In the scribing wheel according to the present aspect, a portion far from the central axis in the circumferential direction of the cut portion may be configured to be in a range of 20 to 50% of a width of the circumferential direction of the groove portion. If it is this range, a blade part will wear, maintaining the shape of a blade part. Therefore, even if the wear of the blade portion progresses, the blade portion can bite into the substrate, and the scribing wheel can form a good scribe line on the substrate. Thus, a long-lived scribing wheel can be configured.

  In the scribing wheel according to this aspect, when viewed in a direction parallel to the central axis, the groove has a convex shape in a direction away from the central axis with respect to the deepest portion in the both sides in the circumferential direction. Can be configured as follows.

  Thereby, the range of the blade portion biting into the substrate becomes wider in the circumferential direction. For this reason, the interval between the indentations formed on the substrate is narrowed, and the vertical cracks formed at the indentations are easily connected. In addition, since the volume of the portion biting into the substrate in the vicinity of the blade increases, the vertical crack can be extended deeper at the position of the dent. Therefore, even if the wear of the blade portion progresses, the scribing wheel can form a vertical crack in the substrate deeper and better.

  The scribing wheel according to the aspect may be configured such that ridge lines of the blade extending along the circumferential direction exist between the grooves adjacent in the circumferential direction. In this case, since the blade portion has a predetermined width in the circumferential direction, the volume of the portion in the vicinity of the blade portion biting into the substrate becomes larger. Therefore, even if the wear of the blade portion progresses, the vertical crack can be formed deeper in the substrate.

  In the scribing wheel according to this aspect, the groove is a curved surface that is convex in a direction away from the central axis when viewed in the circumferential direction, and is far from the central axis of the cut from the boundary in the circumferential direction of the groove. The radius of curvature of the curved surface may be configured to gradually increase toward the portion. According to this configuration, the groove is formed of a convex curved surface in a direction away from the central axis of the scribing wheel, so that when the scribing wheel rolls and the groove faces the substrate, the sharp ridges in the groove contact the substrate There is no such thing as digging deeply. For this reason, it can suppress that a cullet generate | occur | produces because a groove part contact | abuts to a board | substrate.

  As described above, according to the present invention, it is possible to provide a scribing wheel capable of forming a scribe line well on the substrate surface and having a long life.

  The effects and significances of the present invention will become more apparent from the description of the embodiments shown below. However, the embodiments shown below are merely one example when implementing the present invention, and the present invention is not limited at all to those described in the following embodiments.

1 (a) and 1 (b) are respectively a side view and a front view schematically showing a scribing wheel according to a reference example. FIG.1 (c) is a figure which expands and shows a part of outer periphery vicinity of the scribing wheel which concerns on a reference example. Fig.2 (a) is sectional drawing which cut | disconnected the scribing wheel which concerns on a reference example in radial direction by the plane parallel to a central axis in the position of a blade part. FIGS. 2 (b) and 2 (c) are cross-sectional views in which the scribing wheel according to the reference example is cut in the radial direction on a plane parallel to the central axis at the position of the groove. Fig.3 (a) is a figure for demonstrating the shape when the groove part of the scribing wheel which concerns on a reference example is seen in the direction parallel to a central axis. FIG.3 (b) is a figure which shows typically the shape when the groove part of the scribing wheel which concerns on a reference example is seen in the direction parallel to a central axis. FIG.3 (c) is a figure which shows typically a shape when the groove part of the scribing wheel which concerns on the reference example different from FIG.3 (b) is seen in the direction parallel to a central axis. FIG. 4A is a view schematically showing a formation state of a vertical crack when the blade portion of the scribing wheel according to the reference example faces the substrate. FIGS. 4 (b) and 4 (c) are views schematically showing the formation of vertical cracks when the groove of the scribing wheel according to the reference example faces the substrate. Fig.5 (a) is a figure which shows typically the state before pressing the scribing wheel which concerns on a reference example on a board | substrate. FIG. 5B is a view schematically showing a state in which the scribing wheel according to the reference example is in pressure contact with the substrate. FIG.5 (c) is a figure which shows typically the state before pressing the scribing wheel which concerns on a comparative example on a board | substrate. FIG. 5D is a view schematically showing a state in which the scribing wheel according to the comparative example is in pressure contact with the substrate. FIG. 6 is a view schematically showing a state in which the scribing wheel is in pressure contact with the substrate when the blade portion of the scribing wheel according to the reference example is worn. Fig.7 (a) is a figure for demonstrating the shape when the groove part of the scribing wheel which concerns on embodiment is seen in the direction parallel to a central axis. FIG.7 (b) is a figure which shows typically the shape when the groove part of the scribing wheel which concerns on embodiment is seen in the direction parallel to a central axis. FIG.7 (c) is a figure which shows typically the shape when the groove part of the actually manufactured scribing wheel based on embodiment is seen in the direction parallel to a central axis. Fig.8 (a)-(c) is the schematic diagram which showed the result of having measured the depth of the biting to the board | substrate of the scribing wheel which concerns on an Example. FIG. 8D is a schematic view showing the measurement result of the depth of biting into the substrate of the scribing wheel according to the comparative example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each of the drawings, for convenience, an X-axis, a Y-axis, and a Z-axis orthogonal to each other are added. The Z-axis is parallel to the central axis of the scribing wheel.

  First, in describing the embodiment of the present invention, a scribing wheel 10 according to a reference example having a premised configuration will be described with reference to FIGS.

  FIGS. 1A and 1B are a side view and a front view schematically showing the configuration of the scribing wheel 10, respectively. FIG. 1C is an enlarged view of a part around the outer periphery of the scribing wheel 10.

  The scribing wheel 10 has a disk shape in which the edges on both sides of the outer peripheral portion are cut off obliquely. In the outer peripheral portion of the scribing wheel 10, two inclined surfaces 10a inclined in different directions are formed in a side view. A plurality of blade portions 11 are formed by the intersection of the two inclined surfaces 10a, and a groove 12 recessed toward the central axis L0 is formed between the blade portions 11 adjacent in the circumferential direction. The lengths of the blade portions 11 in the circumferential direction are equal to one another. In addition, the lengths of the grooves 12 in the circumferential direction are also equal to one another. Therefore, the pitch of the blade portions 11 in the circumferential direction is constant, and the pitch of the grooves 12 in the circumferential direction is also constant.

  The scribing wheel 10 is formed of cemented carbide, sintered diamond, single crystal diamond, polycrystalline diamond or the like. At the center of the scribing wheel 10, a circular hole 10b is formed in which a shaft serving as a rotation axis is inserted. The diameter of the scribing wheel 10 is about 1 mm to 5 mm, and the thickness is about 0.4 to 1 mm. Further, the angle of the blade portion 11, that is, the angle formed by the two inclined surfaces 10a is about 100 to 160 °, and the diameter of the hole 10b is about 0.4 to 1.5 mm.

  The pitch p1 of the grooves 12 (the sum of the circumferential length L1 of one groove 12 and the circumferential length L2 of one blade 11) is, for example, about 10 to 100 μm. The depth d1 of the groove (difference in radial distance between the ridge line of the blade portion 11 and the groove bottom portion of the groove portion 12) is, for example, about 1 to 6 μm. The circumferential length (L1) of the groove 12 which is the length of the region recessed from the ridge line of the blade 11 on the outer periphery of the scribing wheel 10 is, for example, about 3 to 40 μm. The ratio (L1 / L2) of the circumferential length (L1) of the groove 12 to the ridge length (L2) of the blade 11 (region sandwiched between adjacent grooves 12) is, for example, 0.5-5. It is 0.

  The groove portion 12 is formed of a curved surface which is convex in a direction away from the central axis L0 when viewed in the circumferential direction. The radius of curvature of the radial cross section of the scribing wheel 10 gradually increases from the boundary between the groove 12 and the blade 11 toward the groove bottom in the circumferential direction of the groove 12.

  FIG. 2A is a cross-sectional view in which the scribing wheel 10 is cut in a radial direction at a plane (Y-Z plane) parallel to the central axis L0 at the position of the blade portion 11. FIGS. 2 (b) and 2 (c) are cross-sectional views of the scribing wheel 10 cut in the radial direction at a plane (Y-Z plane) parallel to the central axis L0 at the position of the groove portion 12, respectively. FIGS. 2 (a) to 2 (c) are cross-sectional views at positions A-A ', B-B' and C-C 'in FIG. 1 (c), respectively.

  As shown to Fig.2 (a), the cross-sectional shape of the blade part 11 when it sees in the circumferential direction is V shape of a predetermined angle. Assuming that the cross-sectional shape of the blade portion 11 is an arc-shaped curved surface shape in which the corner of the V shape is rounded, the radius of curvature R is 2 μm or less.

  When the position in the circumferential direction shifts from the blade portion 11 to the groove portion 12, the cross-sectional shape of the groove portion 12 when viewed in the circumferential direction is a circle in which the V-shaped corner is rounded as shown in FIG. It becomes an arc-shaped curved surface shape. FIG. 2 (b) is a radial cross-sectional view of the scribing wheel when the circumferential position is at the shoulder ridge line position of the groove 12. The height of the position on the shoulder ridge line at this time is lower than the height of the ridge line of the blade portion 11 by D1.

  Furthermore, when the position in the circumferential direction shifts from the shoulder ridge line position of the blade 11 to the position of the groove bottom in the center of the blade 11, the cross-sectional shape of the groove 12 as viewed in the circumferential direction is as shown in FIG. As shown, in the entire range of the groove portion 12, the arc has the largest curvature radius. The height of the groove bottom is lower than the height of the ridge line of the blade 11 by D2. D2 corresponds to the depth d1 shown in FIG. 1 (c).

  As described above, in the curved surface shape of the groove 12, the radius of curvature gradually increases from the boundary with the blade 11 toward the groove bottom. In addition, the ridge line in the circumferential direction of the groove 12 gradually lowers relative to the ridge line of the blade 11 from the boundary with the blade 11 toward the groove bottom, and approaches the central axis L0 of the scribing wheel 10 ( Move backward in the Y-axis negative direction). The groove portion 12 is formed, for example, by performing a cutting process using a laser beam on the scribing wheel 10 in which the blade portion 11 is formed over the entire circumference.

  FIG. 3A is a view for explaining the shape when the groove 12 of the scribing wheel 10 is viewed in the direction parallel to the central axis L0. FIG. 3B is a view schematically showing the shape of the groove 12 of the scribing wheel 10 as viewed in a direction parallel to the central axis L0.

  As shown in FIGS. 3A and 3B, a groove 12 having a circumferential width W1 is formed between the adjacent blade portions 11. As shown in FIG. When viewed in the direction (Z-axis direction) parallel to the central axis L0, the groove 12 has a convex shape in the direction away from the central axis L0 on both sides in the circumferential direction with respect to the groove bottom 12a. Here, portions on both sides in the circumferential direction with respect to the groove bottom 12a have a curved shape that is convex in the direction away from the central axis L0. Further, the curvature of this curved shape is increased from the circumferential end of the groove 12 toward the groove bottom 12 a. That is, the angles θ1 and θ2 formed by the ridges of the groove 12 on both sides of the groove bottom 12a and the ridges near the boundary positions P3 and P4 of the blade 11 increase in the direction toward the groove bottom 12a. Further, when viewed in a direction parallel to the central axis L0, the end of the groove 12 on the blade 11 side is connected to the blade 11 in a bent shape at a predetermined angle at boundary positions P3 and P4.

  When tangents Ln1 and Ln2 parallel to the X-Y plane are set in the ridgeline near the boundary positions P3 and P4 on both sides of the groove bottom 12a, the position P2 of the intersection of the tangents Ln1 and Ln2 is higher than the position P1 Away from the central axis L0. That is, the radial distance d12 between the ridge line of the blade 11 and the position P2 is smaller than the radial distance d11 between the ridge line of the blade 11 and the position P1.

  FIG. 3C schematically shows the shape of the groove 12 when the portions on both sides of the groove bottom 12a are rounded in a convex shape in the direction away from the central axis L0 as compared to FIG. 3B. FIG.

  Here, the outer peripheral shape at the boundary positions P3 and P4 is not a shape bent sharply as shown in FIG. 3 (b) but a rounded shape as shown in FIG. 3 (c). In this case, the distance between the position P2 of the intersection of the tangents Ln1 and Ln2 and the position P1 of the groove bottom 12a, that is, the difference between d11 and d12 is larger than in FIG. 3A.

  Next, the action of the blade portion 11 and the groove portion 12 when the scribing wheel 10 rolls on the surface of the substrate 20 in the scribing operation will be described.

  FIG. 4A is a view schematically showing the formation of the vertical cracks 21 when the blade portion 11 of the scribing wheel 10 faces the substrate 20. As shown in FIG. FIGS. 4B and 4C schematically show the formation of the vertical cracks 21 when the groove 12 of the scribing wheel 10 faces the substrate 20. FIG.

  As shown in FIG. 4A, when the blade portion 11 of the scribing wheel 10 faces the substrate 20, the blade portion 11 bites into the substrate 20, causing plastic deformation of the substrate 20 and forming a vertical crack 21 below it. Be done. The substrate 20 is, for example, a glass substrate having a thickness of 1 mm or less. While the blade portion 11 faces the substrate 20, plastic deformation by the blade portion 11 and extension of the vertical crack 21 on the substrate 20 continue.

  After that, when the groove 12 of the scribing wheel 10 comes to face the substrate 20 as shown in FIG. 4B due to the rolling of the scribing wheel 10, the groove 12 is gently changed with the change of the radius of curvature of the groove 12. Is retracted from the vertical crack 21. Then, when the radius of curvature of the groove portion 12 reaches a predetermined size, the groove portion 12 comes into contact with the upper surface of the substrate 20 in a state of being completely retracted from the vertical crack 21, and only presses the upper surface of the substrate 20. Become.

  While the groove 12 presses the upper surface of the substrate 20, the substrate 20 is elastically deformed as shown in FIG. The vertical crack 21 formed immediately before by the blade portion 11 is extended by this pressing. Thus, the vertical crack 21 is also formed at the contact position of the groove 12.

  As described above, after the groove 12 retracts from the vertical crack 21, the groove 12 only presses the upper surface of the substrate 20 to cause elastic deformation and extend the vertical crack 21 immediately before being formed by the blade 11. It is. For this reason, generation of cullet due to plastic deformation is reduced at least in this period. Further, since the cross section in the radial direction of the groove portion 12 is a curved surface convex in the direction away from the central axis L0 of the scribing wheel 10 and no sharp ridges are formed in the groove portion 12, the scribing wheel 10 rolls. When the groove 12 faces the substrate 20, sharp ridges do not bite into the substrate 20 in the groove 12 to cause plastic deformation. Therefore, the occurrence of cullet can be effectively suppressed.

  Further, since the cross section in the radial direction of the groove 12 is a curved surface convex in the direction away from the central axis L0, the blade 11 is moved while the contact position with the substrate 20 shifts from the blade 11 to the groove 12. The groove 12 is gently pulled out of the vertical crack 21 and retracted from the bite state, and the vertical crack 21 is not subjected to a large impact. Therefore, the occurrence of cullet can be suppressed also in this period.

  FIGS. 5 (a) and 5 (b) are schematic diagrams for explaining the scribing wheel 10 having the above-described configuration, and FIG. 5 (a) shows a state before pressing the scribing wheel 10 against the substrate 20. FIG. 5B shows a state in which the scribing wheel 10 is in pressure contact with the substrate 20 in the scribing operation. 5C and 5D are schematic views for explaining the scribing wheel 30 according to the comparative example, and FIG. 5C shows a state before pressing the scribing wheel 30 against the substrate 20. FIG. 5D shows a state in which the scribing wheel 30 is in pressure contact with the substrate 20 in the scribing operation.

  As shown in FIG. 5C, in the scribing wheel 30 according to the comparative example, when viewed in the direction parallel to the central axis L0, the groove portions 32 are formed so as to be recessed in the direction toward the central axis L0 The blade portion 31 is formed between the groove portions 32. At this time, if tangents Ln1 and Ln2 parallel to the X-Y plane are set at ridges near the boundary positions P3 and P4 with the blade 31 at both sides of the groove 32, the position P2 of the intersection of the tangents Ln1 and Ln2 is The central axis L0 is closer than the position P1 of the groove bottom 32a. That is, the radial distance d12 between the ridge line of the blade 31 and the position P2 is larger than the radial distance d11 between the ridge line of the blade 31 and the position P1. The shape of the blade portion 31 is the same as that of the blade portion 11 of the scribing wheel 10 of the reference example. Moreover, the cross section parallel to the radial direction of the groove part 32 becomes a convex curved surface in the direction away from the central axis L0 similarly to the above. Therefore, the radius of curvature of the groove 32 as viewed in the circumferential direction increases as it goes to the groove bottom 32 a of the groove 32.

  Further, as shown in FIG. 5D, in the scribing wheel 30 according to the comparative example, portions on both sides in the circumferential direction with respect to the groove bottom portion 32a of the groove portion 32 are recessed in the direction toward the central axis L0. The portion V1 which bites into the substrate 20 is limited to the blade portion 31 and a part of the groove 32 continuing in the front and back direction, and the interval G1 of the portion V1 which bites into the substrate 20 is wide.

  On the other hand, in the scribing wheel 10 according to the reference example, as shown in FIGS. 5A and 5B, the portions on both sides in the circumferential direction with respect to the groove bottom 12a of the groove 12 move away from the central axis L0. Because of the convex shape, the portion V0 which bites into the substrate 20 extends in a range excluding the vicinity of the groove bottom 12a, and the interval G0 of the portion V0 which bites into the substrate 20 is narrow.

  As described above, in the scribing wheel 10 according to the reference example, the volume of the portion V0 biting into the substrate 20 is significantly larger than that of the scribing wheel 30 according to the comparative example, and the interval G0 of the portion V0 biting into the substrate 20 is It has become significantly narrower. As the volume of the portion biting into the substrate 20 is larger, the substrate 20 is more plastically deformed, and a deeper vertical crack 21 is formed below it. Further, as the distance between the portions biting into the substrate 20 is smaller, the vertical cracks 21 generated by the plastic deformation are more likely to be connected, and the scribe line is formed more favorably.

  Therefore, according to the scribing wheel 10 according to the reference example, it is possible to form a vertical crack 21 deeper than the scribing wheel 30 according to the comparative example directly below the dented position, that is, the position where the blade 11 bites. The vertical cracks 21 formed below 11 can be easily connected to each other. Therefore, according to the scribing wheel 10 according to the reference example, a better scribing line can be formed.

  In the scribing wheel 10 according to the reference example, the volume of the portion V0 biting into the substrate 20 is larger than that of the scribing wheel 30 according to the comparative example, and therefore the blade portion 11 is less likely to bite into the substrate 20 compared to the comparative example. Conceivable. For this reason, in the scribing wheel 10 according to the reference example, as described above, although the vertical crack 21 can be extended deeper immediately below the dented position, the load for causing the blade portion 11 to bite into the substrate 20 becomes large. It can be considered.

  Then, inventors measured the load required in order to form a rib mark in the board | substrate 20 by experiment about the scribing wheel 10 which concerns on a reference example, and the scribing wheel 30 which concerns on a comparative example. In the experiment, a glass substrate of 0.5 mm in thickness was used as the substrate 20. The scribing speed was 100 mm / sec. The configurations other than the shape of the groove portion 12 when viewed in the direction of the central axis L0 are the same for the scribing wheel 10 and the scribing wheel 30. Here, with respect to the scribing wheel 10 according to the reference example and the scribing wheel 30 according to the comparative example, the load can be changed each time a scribe line is formed, rib marks can be formed on the substrate 20, and the scribing quality is The range of good load was confirmed.

  As a verification result, when the scribing wheel 30 according to the comparative example is used, a rib mark is formed, and the load with a good scribing quality is 7.0 to 16.0 N, while the scribing wheel 10 according to the reference example is used. When used, rib marks were formed, and the load with good scribing quality was 5.0 to 15.0 N. As described above, it was confirmed that the vertical cracks 21 can be formed on the substrate 20 with a lower load than the comparative example by using the scribing wheel 10 according to the reference example. Therefore, it has been confirmed that, by using the scribing wheel 10 according to the reference example, it is possible to form a good scribe line even under a lower load.

  However, even with the scribing wheel 10 having such an excellent configuration, the entire scribing wheel 10 is deteriorated while being used. In particular, wear of the blade portion 11 in contact with the substrate 20 of the scribing wheel 10 makes it difficult to form a good scribe line on the substrate 20.

  FIG. 6 is a view schematically showing a state in which the scribing wheel 10 according to the reference example is in pressure contact with the substrate 20 when the scribing wheel 10 is worn.

  At first, the blade portion 11 of the scribing wheel 10 had a shape as shown in FIGS. 5A and 5B. However, along with the use period of the scribing wheel 10, the central axis L0 of the blade portion 11 The wear progresses from the part away from the part, that is, the part in contact with the substrate 20, and the part in contact with the substrate 20 of the blade portion 11 is gradually scraped and changes to a flat shape. As shown in FIG. 6, when the blade portion 11 in which wear has progressed is pressed against the substrate 20, the region of the groove portion 20 bites into the substrate 20 and is parallel to the central axis L0, as compared with the case of FIG. When viewed in the direction, the substrate 20 and the groove bottom 12 a of the groove 12 approach each other. As the wear of the blade portion 11 further progresses, the scribing wheel 10 bites into the substrate 20 to the area of the groove portion 12 as much as the blade portion 11 is scraped. For this reason, the scribing wheel 10 in which the wear has largely progressed makes it difficult to form a good scribe line on the substrate 20.

  As described above, although the scribing wheel 10 according to the reference example forms a scribing line better than that of the scribing wheel 30 according to the comparative example, the blade 11 is largely worn away, and thus the desired scribing line can not be formed.

  Therefore, the inventors examined a scribing wheel that can be used for a longer period of time, even when the blade portion 11 wears, as compared with the scribing wheel 10 according to the reference example. Hereinafter, the shape of such a scribing wheel will be described. In addition, the scribing wheel which concerns on embodiment of this invention is the structure based on the scribing wheel 10 which concerns on said reference example. Therefore, although the description of the same configuration as that of the scribing wheel 10 is omitted, in order to distinguish it from the scribing wheel 10, the reference numerals are changed and described. Further, the effect exerted on the scribing wheel 10 is exerted similarly on the scribing wheel 100 according to the embodiment.

  Fig.7 (a) is a figure for demonstrating the shape when the groove part 102 of the scribing wheel 100 which concerns on embodiment is seen in the direction parallel to a central axis. FIG.7 (b) is a figure which shows typically the shape when the groove part 102 of the scribing wheel 100 which concerns on embodiment is seen in the direction parallel to a central axis.

  In FIG. 7A, the scribing wheel 100, the blade portion 101, and the groove portion 102 correspond to the scribing wheel 10, the blade portion 11, and the groove portion 12 shown in FIG. 3A, respectively. The symbols other than P5, d13, and d14 are the same as those described in FIG.

  As shown in FIG. 7A, the groove portion 102 of the scribing wheel 100 is provided with a deep groove toward the central axis L0 from the position P1 corresponding to the groove bottom portion 12a in the scribing wheel 10 according to the reference example. . As described above, in the groove portion 102 of the scribing wheel 100, the cut portion 102a is formed toward the central axis L0. In FIG. 7A, the deepest portion of the cut portion 102a, that is, the position corresponding to the deepest portion 102b of the groove portion 102 is a position P5. The radial distance between the ridge line of the blade portion 101 and the position P5 corresponds to the distance d13. At this time, the width of the portion far from the central axis L0 in the circumferential direction of the cut portion 102a of the scribing wheel 100 corresponds to the distance d14 in FIG. 7A. That is, the distance d14 is a distance of a portion where the cut portion 102a is formed in the groove portion 102, and is a portion passing through P2.

  FIG. 7C schematically shows the shape of the groove portion 102 in the case where the portions on both sides of the deepest portion 102b are rounded in a convex shape in the direction away from the central axis L0 as compared with FIG. 7B. FIG.

  Here, similarly to the scribing wheel 10 according to the reference example shown in FIG. 3C, the outer peripheral shape at the boundary positions P3 and P4 is not a shape that is sharply bent as shown in FIG. As shown in 7 (c), it has a rounded shape. In this case, as compared with FIG. 7A, the distance between the position P2 of the intersection of the tangents Ln1 and Ln2 and the position P5, that is, the difference between d11 and d13 is larger.

<Example>
Next, in order to verify the effect of the scribing wheel according to the present embodiment, the depth of biting of the scribing wheel into the substrate was measured. This is because after the scribing operation, when viewed in a direction parallel to the central axis of the scribing wheel, the scribing wheel captures an impression that the substrate is in pressure contact with the substrate, and based on this captured image, the depth of the biting into the substrate of the scribing wheel Was measured. The measurement results are schematically shown in FIGS. 8 (a) to 8 (d).

The conditions of the present example and the comparative example are as follows.
(1) Substrate ... Glass substrate, thickness 0.5 mm
(2) Scribe speed ... 100 mm / sec
(3) Scribing wheel diameter ... 2.0 mm
(4) Pin shaft diameter ... 0.8 mm
(5) Depth of groove of scribing wheel ... 6.0 μm
The scribing operation was performed for the substrate and the scribing wheel under the above conditions.

Comparative Example 1
First, the measurement result of Comparative Example 1 is shown in FIG. When scribing was performed using the scribing wheel according to Comparative Example 1 at the maximum load at which a good scribing line was formed, the depth at which the blade portion bited into the substrate was 7.2 μm. In this case, the substrate was in contact at a position beyond the deepest portion of the groove. Moreover, the scribing load at this time was 0.17 MPa.

Example 1
The verification conditions for the scribing wheel according to the first embodiment are the same as the verification conditions (1) to (4) described above. Verification condition (5) The groove depth of the scribing wheel is 6.0 μm, and a notch is further provided toward the central axis of the scribing wheel, and the groove depth is 8.4 μm.

  The measurement result of Example 1 under the above conditions is shown in FIG. When scribing was performed using the scribing wheel according to Example 1 at the maximum load at which a good scribing line was formed, the depth when the blade portion bited into the substrate was 7.2 μm . In this case, the substrate was not in contact with the deepest portion of the groove. Moreover, the scribing load at this time was 0.17 MPa.

Example 2
The verification conditions for the scribing wheel according to the second embodiment are the same as the verification conditions (1) to (4) of the first embodiment. Verification condition (5) The groove depth of the scribing wheel was set to 9.4 μm from 6.0 μm and further by providing a notch toward the central axis of the scribing wheel.

  The measurement result of Example 2 under the above conditions is shown in FIG. The depth when the blade portion of the scribing wheel according to the second embodiment bites into the substrate is 6.8 μm. In this case, the substrate was not in contact with the deepest portion of the groove. The scribing load at this time was 0.16 MPa.

[Example 3]
The verification conditions for the scribing wheel according to the third embodiment are the same as the verification conditions (1) to (4) of the first embodiment. Verification condition (5) The groove depth of the scribing wheel was set to 10.1 μm, by further providing a notch toward the central axis of the scribing wheel from 6.0 μm.

  The measurement result of Example 3 under the above conditions is shown in FIG. The depth at which the blade portion of the scribing wheel according to Example 3 bites into the substrate is 7.2 μm. In this case, the substrate was not in contact with the deepest portion of the groove. The scribing load at this time was 0.16 MPa.

  From the above measurement results, in any of Examples 1 to 3 in which the cut portion is formed in the groove portion of the scribing wheel, the deepest portion of the groove portion of the scribing wheel is the substrate even at the maximum load capable of forming a good scribe line. There was no contact. On the other hand, in the scribing wheel according to Comparative Example 1 in which the cut portion was not provided in the groove portion, the depth cut into the substrate was deeper than the depth of the groove.

  From the above results, it was shown that when the cut portion is provided in the groove of the scribing wheel, the substrate does not come in contact with the deepest portion of the groove even when the blade of the scribing wheel deeply bites into the substrate.

  In addition, a scribing wheel in which the ratio of the width in the circumferential direction of the groove to the portion distant from the central axis in the circumferential direction of the cut portion of the scribing wheel, that is, the portion corresponding to the distance d14 shown in FIG. The same verification was carried out at. As a result, the dents formed on the substrate by the scribing wheel in which the ratio of the portion corresponding to the distance d14 and the width in the circumferential direction of the groove portion is 29% and 49% were good. On the other hand, in the scribing wheel in which the ratio of the portion corresponding to the distance d14 and the width in the circumferential direction of the groove portion exceeds 50%, the result of the shape of the dent formed is slightly poor.

  Further, from the results of Example 1, the same verification as described above was performed by providing a cut in the groove of the scribing wheel and setting the depth of the groove to 7.0 μm. As a result, the substrate was not in contact with the deepest portion of the groove of the scribing wheel. Moreover, the shape of the dent formed in the board | substrate was favorable.

  From these results, the depth of the groove portion of the scribing wheel is in the range of 7 to 10 μm, and the portion far from the central axis in the circumferential direction of the cut portion is in the range of 20 to 50% of the width in the circumferential direction of the groove portion. It was found that the deepest portion of the groove portion of the scribing wheel did not contact the substrate, and the shape of the dent became good.

<Effect of the embodiment>
According to the present embodiment, the following effects are achieved.
As shown in FIGS. 5 (a) and 7 (a) to 7 (c), when the scribing wheel 100 rolls on the surface of the substrate 20, a portion near the blade portion 101 bites into the substrate 20, and the substrate A dent is formed on the surface of 20. At this time, since the groove portion 102 has the shape shown in FIGS. 7A to 7C, the range of the portion V0 biting into the substrate 20 near the blade portion 101 becomes wider in the circumferential direction. For this reason, the interval G0 of the indentations formed on the substrate 20 becomes narrow, and the vertical cracks 21 formed at the indentations are easily connected. Further, since the volume of the portion V0 biting into the substrate 20 in the vicinity of the blade portion 101 is increased, the vertical crack 21 can be extended deeper at the dented position. Therefore, according to the scribing wheel 100 according to the embodiment, the vertical cracks 21 can be formed deeper and favorably in the substrate 20.

  As shown in FIGS. 7A to 7C, when viewed in a direction parallel to the central axis L0, in the groove portion 102, portions on both sides in the circumferential direction with respect to the deepest portion 102b move away from the central axis L0. It is formed to have a convex shape. Accordingly, the groove portion 102 easily bites into the substrate 20 as the scribing wheel 100 rolls.

  Further, the shapes of the portions on both sides in the circumferential direction with respect to the deepest portion 102b have a generally gentle curve shape when viewed in the direction parallel to the central axis L0. In particular, as shown in FIG. 7A, the portions on both sides in the circumferential direction with respect to the portion at the position P1 in the circumferential direction are formed to have a curved shape. Thus, the groove 102 bites into the substrate 20 smoothly as the scribing wheel 100 rolls. Thus, the vertical cracks 21 can be formed smoothly on the substrate 20. The portion of position P1 in the circumferential direction from position P5 corresponding to deepest portion 102b may be formed to be substantially linear. Even in such a case, the shapes of the portions on both sides in the circumferential direction with respect to the deepest portion 102b have a generally gentle curve shape as viewed in the direction parallel to the central axis L0. The wheel 100 can bite into the substrate 20 smoothly.

  As shown in FIGS. 7A to 7C, the scribing wheel 100 is configured such that ridge lines of the blade portion 101 extending along the circumferential direction exist between the groove portions 102 adjacent in the circumferential direction. As a result, since the blade portion 101 has a predetermined width in the circumferential direction, the volume of the portion V0 near the blade portion 101 biting into the substrate 20 is further increased. Thus, the vertical cracks 21 can be formed deeper in the substrate 20.

  As shown in FIGS. 2B and 2C, the groove 12 is a curved surface convex in the direction away from the central axis L0 when viewed in the circumferential direction, and the deepest portion of the groove 12 from the boundary between the groove 12 and the blade 11 The radius of curvature of the curved surface gradually increases toward the portion 12a. Thus, when the groove 12 is a curved surface that is convex in the direction away from the central axis L 0 of the scribing wheel 10, when the scribing wheel rolls and the groove 12 faces the substrate 200, the inside of the groove 12 is Sharp ridges never penetrate deep into the substrate. For this reason, it can suppress that a cullet generate | occur | produces, when the groove part 102 contact | abuts to the board | substrate 20. FIG. The same applies to the embodiment in which the groove portion 12 of the scribing wheel 10 is provided with the cut portion and the scribing wheel 100 is used.

  As shown in FIGS. 8A to 8C, the groove portion 102 is provided with a cut portion 102a. At this time, if the depth of the groove is in the range of 7 to 10 μm, the substrate 20 does not contact the deepest portion 102b of the groove 102 when the scribing operation is performed under the normal scribing conditions. Therefore, even when the wear of the blade portion 101 progresses, the substrate 20 can be bitten into for a predetermined period, and a scribe line can be formed on the substrate 20. Thus, the scribing wheel 100 has a long life.

  If the depth of the groove is in the range of 7 to 10 μm, the blade portion 101 wears while maintaining the original shape of the blade portion of the scribing wheel. Therefore, the shape of the indentation formed on the substrate 20 is good.

  Besides the above, the embodiment of the present invention can be variously modified as appropriate within the scope of the technical idea shown in the claims.

100 ... scribing wheel 101 ... blade part 102 ... groove part 102a ... cut part 102b ... deepest part 20 ... board L0 ... central axis

Claims (6)

A scribing wheel for forming a scribing line on a substrate,
A plurality of blades formed along the outer peripheral edge,
A plurality of groove portions provided between the blade portions adjacent in the circumferential direction and recessed on the central axis side;
Equipped with
The groove portion is formed with a notch toward the central axis at a central portion in the circumferential direction.
At least the deepest portion of the cut portion is a depth not to contact the substrate,
A scribing wheel characterized by In the scribing wheel according to claim 1,
When viewed in a direction parallel to the central axis, the depth to the deepest portion of the cut portion in the groove is in the range of 7 to 10 μm.
A scribing wheel characterized by In the scribing wheel according to claim 1 or 2,
In the circumferential direction of the cut portion, a portion far from the central axis is in the range of 20 to 50% of the circumferential width of the groove portion.
A scribing wheel characterized by In the scribing wheel according to any one of claims 1 to 3,
When viewed in a direction parallel to the central axis, the groove portion has a convex shape in a direction away from the central axis, with respect to the deepest portion, portions on both sides in the circumferential direction.
A scribing wheel characterized by The scribing wheel according to any one of claims 1 to 4, wherein
Between the grooves adjacent in the circumferential direction, ridge lines of the blade portions extending along the circumferential direction exist.
A scribing wheel characterized by The scribing wheel according to any one of claims 1 to 5, wherein
The groove portion is formed of a curved surface convex in a direction away from the central axis when viewed in the circumferential direction,
The radius of curvature of the curved surface is gradually increased from the circumferential boundary of the groove toward a portion farther from the central axis of the cut portion.
A scribing wheel characterized by

Images